php手冊 雜項函數大全（解析）

switch(connection_status())
{
case CONNECTION_NORMAL:
   $txt = 'Connection is in a normal state';//連接配接運作正常
   break;
case CONNECTION_ABORTED:
   $txt = 'Connection aborted';//連接配接由使用者或網絡錯誤終止
   break;
case CONNECTION_TIMEOUT:
   $txt = 'Connection timed out';// 連接配接逾時
   break;
case (CONNECTION_ABORTED & CONNECTION_TIMEOUT):
   $txt = 'Connection aborted and timed out';
   break;
default:
   $txt = 'Unknown';//未知錯誤
   break;
}

echo $txt;      

define("GREETING","Hello world!");//定義常量
echo constant("GREETING");//輸出常量      

define("GREETING","Hello world!",true);//定義常量,不區分大小寫
echo constant("greeting");//輸出常量      

define("GREETING","Hello world!");
echo defined("GREETING");//判斷常量是否存在      

$site = "666";
fopen($site,"r")
or die("Unable to connect to $site");//輸出資訊，并推出目前程式
echo "66666448";
?>      

$string = "beautiful";
$time = "winter";

$str = 'This is a $string $time morning!';
echo $str. "
";
eval("\$str=\"$str\";");//必須以分号;結束，不然會報錯
echo $str;      

$site="6666";
fopen($site,"r")
or exit("Unable to connect to $site");      

echo $_SERVER['HTTP_USER_AGENT'];
$browser=get_browser(null,true);//傳回浏覽器的性能
print_r($browser);      

echo date('h:i:s');
sleep(10);
echo "
";//耐心等十秒
echo date('h:i:s');      

echo uniqid();//重新整理都會變.以微秒計的目前時間，生成一個唯一的 ID。      

echo date('h:i:s') . "
";

//延遲 10 描述
usleep(10000000);//一微秒等于百萬分之一秒。

//再次開始
echo date('h:i:s');
?>